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Page 18
AVSP-DVI1X2
Chapter 3: Installation
Blu-ray uses a blue-violet laser to read and write data, while current optical disc
technologies such as DVD, DVD±R, DVD±RW, and DVDRAM rely on a red laser to
read and write data. Blu-ray uses a blue-violet laser (405 nm) that it has a shorter
wavelength than a red laser (650 nm), which makes it possible to focus the laser
spot with even greater precision. This enables data to be packed more tightly and
stored in less space, so it’s possible to fit more data on the disc even though it’s the
same size as a CD/DVD.